My passenger window would sometimes crawl to a stop on the way up and I would have to let go of the switch and press it again to get it to go up all the way. Just installed my Window Turbo and now it at least tripled the speed on my passenger side. Very satisfied!
These came off my 1987 GN. Not sure how old they are or how many miles on them. They were on the car when I bought it. I went back to grey wires for the looks. My car has only 37,000 miles on it, so I am sure there aren't that many miles on them.